Software Engineering Institute | Carnegie Mellon University
Software Engineering Institute | Carnegie Mellon University

Digital Library

Javascript is currently disabled for your browser. For an optimal search experience, please enable javascript.

Advanced Search

Basic Search

Content Type

Topics

Publication Date

Sarah Sheard
March 2017 - Presentation Measuring Complexity for System Safety Assurance

Authors: Sarah Sheard, Michael D. Konrad, William Nichols, Charles B. Weinstock

This presentation describes a two-year research effort to define complexity measures for avionics systems in order to help the FAA identify when systems are too complex to assure their safety.

March 2017 - Presentation Methodology for Comparing Cloud Service Offerings

Authors: Jeff Davenport, Sarah Sheard

This presentation describes a methodology for normalizing the offerings into common units of measure that are relevant to the procurer of the services.

November 2016 - White Paper FAA Research Project on System Complexity Effects on Aircraft Safety: Testing the Identified Metrics

Topics: Measurement and Analysis

Authors: Michael D. Konrad, Sarah Sheard, Charles B. Weinstock, William Nichols

This report describes a test of an algorithm for estimating the complexity of a safety argument.

November 2016 - White Paper FAA Research Project on System Complexity Effects on Aircraft Safety: Estimating Complexity of a Safety Argument

Topics: Measurement and Analysis

Authors: Michael D. Konrad, Sarah Sheard, Charles B. Weinstock, William Nichols

This report presents a formula for estimating the complexity of an avionics system and directly connects that complexity to the size of its safety argument.

November 2016 - White Paper FAA Research Project on System Complexity Effects on Aircraft Safety: Identifying the Impact of Complexity on Safety

Topics: Measurement and Analysis

Authors: Sarah Sheard, Charles B. Weinstock, Michael D. Konrad, Donald Firesmith

This report organizes our work on the impact of software complexity on aircraft safety by asking, “How can complexity complicate safety and, thus, certification?”

November 2016 - White Paper FAA Research Project on System Complexity Effects on Aircraft Safety: Candidate Complexity Metrics

Topics: Measurement and Analysis

Authors: William Nichols, Sarah Sheard

This special report identifies candidate measures of complexity for systems with embedded software that relate to safety, assurability, or both.

November 2016 - White Paper FAA Research Project on System Complexity Effects on Aircraft Safety: Literature Search to Define Complexity for Avionics Systems

Topics: Measurement and Analysis

Authors: Michael D. Konrad, Sarah Sheard

This special report describes the results of a literature review sampling what is known about complexity for application in the context of safety and assurance.

October 2016 - Technical Report Definition and Measurement of Complexity in the Context of Safety Assurance

Topics: Performance and Dependability

Authors: Sarah Sheard, Michael D. Konrad, Charles B. Weinstock, William Nichols

This report describes research to define complexity measures for avionics systems to help the FAA identify when systems are too complex to assure their safety.

October 2016 - Presentation What Do Systems Engineers Need To Know About Software?

Authors: Sarah Sheard

This presentation was given at the NDIA (National Defense Industrial Association) Systems Engineering Conference, held in Springfield VA, 24-27 October 2016.

August 2016 - Technical Note The QUELCE Method: Using Change Drivers to Estimate Program Costs

Topics: Measurement and Analysis

Authors: Sarah Sheard

This technical note introduces Quantifying Uncertainty in Early Lifecycle Cost Estimation (QUELCE), a method for estimating program costs early in development.

April 2016 - White Paper The QUELCE Method: Using Change Drivers to Estimate Program Costs

Topics: Measurement and Analysis

Authors: Sarah Sheard

This report introduces the Quantifying Uncertainty in Early Lifecycle Cost Estimation (QUELCE) method for estimating program costs early in a development lifecycle.

November 2015 - Presentation Managing Software and System Complexity

Authors: Sarah Sheard

This presentation discusses the research the SEI is doing to determine what characteristics of avionics systems can be measured to help evaluate whether a system is capable of being certified as safe.

July 2015 - Podcast Reducing Complexity in Software & Systems

Topics: Performance and Dependability

Authors: Sarah Sheard

In this podcast, Sarah Sheard discusses research to investigate the nature of complexity, how it manifests in software-reliant systems such as avionics, how to measure it, and how to tell when too much complexity might lead to safety problems.

February 2015 - Technical Report A Dynamic Model of Sustainment Investment

Topics: Process Improvement, Measurement and Analysis

Authors: Sarah Sheard, Robert Ferguson, Andrew P. Moore, Mike Phillips

This paper describes a dynamic sustainment model that shows how budgeting, allocation of resources, mission performance, and strategic planning are interrelated and how they affect each other over time.

October 2014 - Article Dynamics of Software Sustainment

Topics: Measurement and Analysis

Authors: Sarah Sheard, Robert Ferguson, Mike Phillips, Andrew P. Moore

This paper describes the development of a dynamic economic model of sustainment to predict the consequences of funding decisions within sustainment organizations.

March 2014 - Presentation Modeling Sustainment Dynamics

Topics: Measurement and Analysis

Authors: Sarah Sheard, Andrew P. Moore, Robert Ferguson

This presentation overviews a systems dynamics simulation model that describes influences of multiple variables on the sustainment phase of a system.

February 2014 - Special Report Wireless Emergency Alerts: Trust Model Technical Report

Topics: Measurement and Analysis

Authors: Robert W. Stoddard, Joseph P. Elm, James McCurley, Sarah Sheard, Tamara Marshall-Keim

This report describes a trust model to enable the Federal Emergency Management Agency to maximize the effectiveness of the Wireless Emergency Alerts (WEA) service and provides guidance for alert originators in using WEA to maximize public safety.

March 2003 - Technical Note DoD Architecture Framework and Software Architecture Workshop Report

Topics: Software Architecture

Authors: William G. Wood, Lyn Uzzle, John Weiler, Art Krummenoehl, Mario R. Barbacci, Paul C. Clements, Steve Palmquist, Huei-Wan Ang, Loring Bernhardt, Fatma Dandashi, David Emery, Sarah Sheard

This report summarizes the activities of the Workshop on the Department of the 2003 Defense Architecture Framework and Software Architecture workshop.